Process for the preparation of synthesis gas from black liquor

Details Process for the preparation of synthesis gas from black liquor Process for the preparation of synthesis gas from black liquor

2009-04-28

2011-10-18

Langel, Wayne (Department: 1736)

Compositions

Gaseous compositions

Carbon-oxide and hydrogen containing

C048S127100, C048S1970FM, C048S204000, C423S650000

Reexamination Certificate

active

08038906

ABSTRACT:
A process for the adjustment of the composition of a synthesis gas produced in a high temperature black liquor gasifier. The process includes the steps of (a) generating a gasifier effluent stream from black liquor in the gasifier by a blast and optionally an atomising stream; (b) optionally quenching the gasifier effluent stream with a gas stream to form a gas quenched effluent stream; (c) quenching the gasifier effluent of step (a) or the gas quenched effluent gas stream of step (b) with a water stream to form a raw synthesis gas; (d) further cooling and cleaning and separating the raw synthesis gas to form a purified unprocessed synthesis gas with an appropriate H2/CO ratio; (e) partly converting the purified synthesis gas to dimethyl ether in a synthesis section, producing at least a product stream of DME and a hydrogen rich purge stream of processed; (f) splitting and recycling individual or combinations of split streams of the processed or the unprocessed synthesis gas to step a and/or step (b); and recycling a by-product stream of CO2being further generated in step (e) in part or completely to step (a) and/or step (b).

REFERENCES:
patent: 4808264 (1989-02-01), Kignell
patent: 2004/0055716 (2004-03-01), Landalv et al.
patent: 2009/0199476 (2009-08-01), Taylor
patent: WO 02/40768 (2002-05-01), None

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